These terms are used in jewellery making and/or glass fusing. Where the meaning of a term is specific to one of these subjects this will be highlighted. Some terms may have multiple meanings.
|Carat||A measure of weight used for gemstones. 1 carat = 300 milligrams. The term carat being derived from the carob seeds used by early gem traders on the balance scales. The carob seed being very uniform in size.|
|Facet||One of the small flat surfaces of a faceted gemstone.|
|Inclusion||An internal flaw in a gemstone that can reduce the clarity.|
|Octahedron||A polyhedron with eight faces, twelve edges, and six vertices|
|Pavilion||That part of a gemstone below the girdle.|
|Point||When referring to gemstones, this is a measure of weight. There are 100 points per carat.|
|Polyhedron||A solid in three dimensions with flat polygonal faces, straight edges and sharp corners or vertices.|